Achatina. MOLLUSCA. PULMONIFERA. 267 



Gen. XX. ACHATINA. — Aperture of the shell longer 

 than broad ; the lip at the pillar truncated. 



85. A. acicula — Shell slender, tapering, the last whorl near- 

 ly as long as all the preceding ones. 



Buccinum acicula, Mill. Verm. ii. 150.— B. turritum quinque anfracti- 



bus apertura ovali, Walk. Test. Min. t. 11. f. 60 — B. terrestre, Mont. 



Test. Brit. 248. t. viii. f. 3. — At the roots of grass and moss, England. 



Length ^th of an inch ; whorls six, white, glossy, rather flat ; separating 



line distinct ; mouth, with the outer lip thin, nearly even, ending at the 



pillar in a short gutter ; inner-lip at the extremity of the pillar subrecurved. 



The Achatina octona ; the Buccinum tenue album octo minimum orbium o 

 List. Conch, t. xx. f. 15. ; the Helix octona of Dr Maton and Mr Rackett, 

 Linn. Trans, vol. viii. t. v. f. 10., has been hastily considered as referred to 

 bv Dr Pultney, under the title of Helix octona, Dorset, Cat. p. 49. This is 

 an extra European species, and the shell of Dr Pultney is probably only the 

 Lymnea octona. 



Gen. XXI. SUCCINEA. — Shell with a short pointed spire ; 

 mouth longer than broad. 



86. S. putris. — Shell oblong, of three whorls, with a yellow- 

 ish tinge. 



Buccinum subflavum pellucidum trium spirarum, List. An. Ang. 141. 

 t. ii £ 24. ; Conch, t. 123. f. 23.— Helix putris, Linn. Syst. i. 1249. 



H. succinea, Mull. Verm. ii. 97- — H. putris, Mont. Test. Brit. 376. 



t. xvi. f. 4. — Among subaquatic plants, common. 

 Length about fths of an inch, of a yellow or green tinge, finely striated by 

 the layers of growth. Body-whorl very large, the other small, pointed ; aper- 

 ture very wide in front, thin. Animal cinereous; the longest tentacula 

 contracted in the fore part. A variety of the shell sometimes occurs with a 

 thickened, expanded subreflected white lip. 



-Gen. XXII. V1TRINA. — Shell with a depressed spire; 

 mouth transverse. 



87. V. pellucida. — Whorls three, glossy, transparent. 



Helix pellucida, Mull. Verm. ii. 15 — Vitrina pellucida, Drop. MolL 119. 



Hel. elliptica, Brown, Wern. Mem. ii. 525. t. xxiv. f. 8 — Vit. pell. 



Flem. Phil. Zool. ii. 459. t. iv. f. 1.— Common among moss and grass. 

 Breadth nearly T 2 3 ths ; month rounded, the lip thin, slightly reflected at 

 the small pillar cavity. The margin of the shield of the animal is double ; 

 the upper fold divided into several lobes, which are capable of being reflected 

 over the shell. In 1809, I sent this shell from Zetland, to the late Mr Mon- 

 tagu, who considered it as the fry of the Helix nitida. 



